Fox is even more complicated than that. There was also a Baltimore Fox company, Philadelphia ArmsCompany and AHFox Company. And Ansley had some connection with all three. He was a part of Philadelphia Arms Company which made this gun. He quit there in December 1904. Later as AHFox his third gun company he bought the physical plant that PAC had built in November 1906. The Baltimore Fox was his as well with several partners for money. It failed. PAC was next and it failed. AHFox was last and he ended up selling out, which is a nice way to say it was failing, it was later sold again and everything moved to NY.

So three different Fox guns, three different Fox gun companies, three different cities and states involved. One thing they all had in common was Ansley. His design got better as time went by, but he entered the double gun business towards the end of mass production numbers and when the repeater was quickly taking over.

Most PAC guns were well made, with good barrels. 3” was not really a factory chambering but the barrels would be capable of any shell made in that day. The later Winchester 3” shell was 20+ years away when this gun was made. I’d pass on the gun as a good 3” shooter. If that’s what you want there are hundreds of AYA doubles with factory 3” chambers that are in the same price range.